Keyboard



FIG. 1 is a front perspective view of a keyboard showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a left side view thereof.

The broken line showing of the remainder of the keyboard in FIGS. 3-7 is for environmental purposes only and forms no part of the claimed design. 

The ornamental design for a keyboard, as shown and described. 